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CVE-2026-45837

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free in arena_vm_close on fork arena_vm_open() only bumps vml->mmap_count but never registers the child VMA in arena->vma_list. The vml->vma always points at the parent VMA, so after parent munmap the pointer dangles. If the child then calls bpf_arena_free_pages(), zap_pages() reads the stale vml->vma triggering use-after-free. Fix this by preventing the arena VMA from being inherited across fork with VM_DO
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:13a6fb0a51790bc5d0376898eafbf5d8d07f26c4e0a3884375b5404467cf58b6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/arena.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual"…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/bpf/arena.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"723b9fa930cc277c15ce6b9ec9feec828cfac9d7","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"d18099f19e53250f8ad2801498b88cec29d9107a","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"201128fcc7b213d27ab77bc4e89488b41796480f","status":"affected","version":"317460317a02a1af512697e6e96…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/arena.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual"…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/bpf/arena.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"723b9fa930cc277c15ce6b9ec9feec828cfac9d7","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"d18099f19e53250f8ad2801498b88cec29d9107a","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"201128fcc7b213d27ab77bc4e89488b41796480f","status":"affected","version":"317460317a02a1af512697e6e96…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/affected/0

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/201128fcc7b213d27ab77bc4e89488b41796480f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/4fddde2a732de60bb97e3307d4eb69ac5f1d2b74"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/723b9fa930cc277c15ce6b9ec9feec828cfac9d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/d18099f19e53250f8ad2801498b88cec29d9107a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:04430fc1e748b24aa1ded7e688d80ad6abb610bac2a0cd3436e9f496250192d2 · sha256:e9728f21d4be4408… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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